Which joseki have been discarded and why?
Yes, can anybody give examples of some well known joseki which is not just out of fashion, but has actually been recently demolished? That would be interesting! Charles, can you?
Tamsin
I'm not Charles, but I do have something that I got from Alexandre Dinerchtein, if that will suffice: (example moved to catenaccio joseki).
I can think of three reasons for joseki being discarded:
1. Improvements/Fashions in Go Theory e.g. The joseki is not efficient, or the joseki is superseded by one placing more influence on the centre.
2. Improvements in tactics. e.g Turning inwards in the large avalanche.
3. Changes in rules. e.g Intoduction and changes to komi - A joseki that results in an equal exchange of territory is likely to be rejected by Black as being too slow. Black may prefer something more dynamic, such as an exchange of influence for territory.
Old joseki that were thought extinct will continue to appear in my opinion, if the surrounding positions justify it.
Charles There would also be the situation corresponding in languages to expressions that are no longer idiomatic: the plays are quite comprehensible to pros, but somehow don't fit with a current way of thinking.
Further comment on catenaccio joseki moved there.
Also, things fall out of fashion for no apparent or good reason. The aigosumi joseki[1] is an example of this. Jowa used it successfully and there are no weaknesses in it. Fashion however deems it too slow. Not a good reason, in my opinion.--TimBrent
[1] At a guess, we're talking about this :
In any case this is on-topic, because this was played often around 1820, and then dropped out of fashion. But Chang Hao played it in 2002. One can guess that increases in komi cause trials to be made of discarded joseki, by White.
BobMcGuigan--It's interesting to me that this pattern, played in the era of no-komi go, was rejected then as too slow and is being tried again as komi increases. With no komi White has to try harder with more severe or even risky moves. On the other hand, as komi increases White seems to feel able to relax a bit. But I wonder whether standard moves in the no-komi era wouldn't work just as well in the komi era. But of course I'm forgetting the effect of giving komi on Black. Now Black has to play more severely whereas before it was, perhaps, possible to relax a little. This would all fit under the rubric The Psychology of Komi